Dr. Osiek had a metaphor for Jesus she uses to understand the Jesus in the Gospel of John. Slides into a projector.
At first the projector is just a white square, but putting a slide in gives the white light box color, shape and tone. The slide gives the light meaning.
God is this flood of light. And white light has all color. Light is also a mystery in that it has both properties of a wave and a particle. Light is this which can be seen but not totally understood. So as the projector shines white light, so is God. Just as white light is incomprehensible, so is God.
But as a slide is put into the projector the white light gains meaning. The light is able to be understood and comprehended but us who are not able to fully see the white light. Likewise, Jesus is that slide for God. Jesus gives us the ability to see God in a way we would otherwise not be able to understand.